I've executed "do-release-upgrade" to upgrade the Ubuntu to 13.04, but Ubuntu still keeps telling me about the new release. Here is the welcome message:

Welcome to Ubuntu 13.04 (GNU/Linux 3.8.4-x86_64-linode31 x86_64)

* Documentation: https://help.ubuntu.com/

System information as of Tue May 14 08:52:42 UTC 2013

System load: 0.9 Processes: 133
Usage of /: 10.1% of 23.17GB Users logged in: 0
Memory usage: 18% IP address for eth0: 192.155.86.190
Swap usage: 0% IP address for tun0: 10.82.150.1

Graph this data and manage this system at https://landscape.canonical.com/

New release '13.04' available.
Run 'do-release-upgrade' to upgrade to it.

But if I execute `do-release-upgrade` again it will say

Checking for a new Ubuntu release
No new release found

How to resolve the inconsistency? Thank you.

deleted

Yes, this is the case and solution, thank you. I should have checked it first.